all have mechanical oil pressure, 55's mostly have mechanical temp, 56-59 have electric temp .... will be pretty easy to tell looking at the back of the gauge cluster

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot